How to crop from Top & Bottom of Video
The easiest way to do this effect is to animate the Y offset in sync with the bottom crop.
So enable Crop and Offset and insert a keyframe with 0 value for Offset &gt; Position Y, Crop Top and Crop Bottom where you want the animation to start.
Divide your video's height by 2 then go to the frame when you want the animation to finish and insert a keyframe at that same value for all three fields.
Done!